function initialize() {
  var demos = {
    'hello-map': 'Exercise #1: Hello, Map!',
    'mashup': 'Exercise #2: Mashing it up',
    'custom': 'Exercise #3: Customizing the map mashup',
    'ft': 'Exercise #5 and #6: Tons of Markers'
  };
  var p = document.getElementById('map-canvas');
  p.innerHTML = '<h2>Exercises:</h2>';

  for (var demo in demos) {
    p.innerHTML += '<a href="?' + demo + '/1.js">' + demos[demo] + '</a><p>';
  }
}
